
G-Force GFR4000 IR340 Shank

Features:
- Easy to service
- Special heat-treated alloy piston for long life, Rockwell hardness 60
- Minimum loss of performance when injecting foam or water
Item # | Description | Part # |
1 | Back Head | G4001 |
2 | Back Head O-Ring | G4002 |
3 | Choke | |
4 | Air Check Valve | G4004 |
5 | Air Check Valve Spring | G4005 |
6 | Make-Up Rubber (Buffering) | G4006 |
7 | Air Guide | G4007 |
8 | Air Distributor | G4008 |
9 | Air Distributor O-Ring | G4009 |
10 | Cylinder | G4010 |
11 | Cylinder Stop Ring | G4011 |
12 | Wear Sleeve | G4012 |
13 | Piston | G4R4013 |
14 | Piston Stop Ring | G4R4014 |
15 | Bit Retaining O-Ring | G4R4015 |
16 | Bit Retaining Ring | G4R4016 |
17 | Chuck (Drive Sub) | G4R4017 |
Choke Plug Kit | G4029 | |
O-Ring Kit | G4030 |
Specifications
Length (w/o drill bit) | 37.83" |
Outside Diameter | 3.858" |
Weight (w/o bit) | 78.9 lbs. |
Cylinder Bore | 3.229" |
Piston O.D. | 3.224" |
Piston Stroke | 3.74" |
Piston Weight | 20.3 lbs. |
Hole Sizes | 4" - 6" |
Air Pressure Consumption | 100 psi - 350 psi |
Wrench Size | A/F 3.15" |
Connection | Std. 2 7/8" API Reg Pin |
Air Consumption Chart
PSI | 150 | 200 | 250 | 300 | 350 | 400 |
CFM with blank choke | 240 | 340 | 440 | 540 | - | - |
with 1/8" choke | 375 | 595 | 760 | 925 | 1,060 | 1,205 |
with 1/4" choke | 425 | 665 | 845 | 1,095 | 1,270 | 1,350 |
All Hammers come Fitted with blank Choke located in the Air Check Valve
Hammer Service Log
Wear Sleeve / Piston Clearance
Part | New Dimension | Discard Clearance | |
Wear Sleeve | A | 3.228" | greater than or equal to 0.010" |
Piston OD | B | 3.224" |

Inner Cylinder / Piston Clearance
Part | New Dimension | Discard Clearance | |
Cylinder ID | C | 2.756" | greater than or equal to 0.010" |
Piston OD | D | 2.752" |

Distributor Probe / Piston ID Clearance
Part | New Dimension | Discard Clearance | |
Distributor Probe OD | F | 0.978" | greater than or equal to 0.010" |
Piston ID | E | 0.984" |

External Wear
Description | Wear Limit |
Wear Sleeve Discard Dimension | 3.425" |
NOTE: Chuck should be replaced when wear transfers to wear sleeve. |
Lubrication
G-Force Series Hammers are precision-made tools and should be treated as such. Only the highest quality lubrication should be used and a constant flow of oil must be maintained at all times. Recommended lubrication amount 1/3 Pint per 100 cfm per hour.Recommended Grades of Lubricant
ESSO MATEX CASTROL SHELL MOBILE | AROX EP 150 RDO 302 RD OIL DP 100 AIR TOOL OIL 2 A 320 ALMO NO. 5 |
Recommended Pull Down
Minimum @ 100 psi - 500 lbs. | Maximum @ 350 psi - 1800 lbs. |
Missile Warranty will be voided by the following:
Welding on Wear Sleeve.
Heating Case with a Torch.
Gripping Wrenches across Threads.
Hammering on Casing.